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                <div class="text">雄性激素脱发</div>
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                ANDROGEN ALOPECIA
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                <div class="label">定义</div>
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                一般多发于体内雄性激素分泌过多，或者对雄性激素的敏感性过强的人群。
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                雄性激素性脱发也常伴有头皮大量出油的情况发生，与脂溢性脱发表征极为相似，但脂溢性脱发人群是油渍性头皮，而雄性激素性脱发人群也有头皮不大量出油的情况。另外女性也会患有此类脱发，伴随整个头部的头发变稀，但发际线不会退缩。女性的雄性激素性脱发很少导致完全脱发。
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                此类人群头皮中双氢睾酮(DHT)的水平比正常人要高。双氢睾酮(DHT)是人体内正常分泌的雄性激素睾酮与 5α还原酶结合下形成的产物。5α还原酶主要分布于头顶区域，后枕部及两侧区域密度偏低，在这种酶作用下，大量睾酮转变为双氢睾酮（DHT），而双氢睾酮会攻击毛囊，导致毛囊萎缩直至闭合。
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